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Synthesis,Characterization and Application Explorations of Graphene

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Synthesis,Characterization and Application Explorations of G...

Embedding Co3O4 nanoparticles into graphene nanoscrolls as anode for lithium ion batteries with superior capacity and outstanding cycling stability

中国力学学会学术大会'2009

作者： Wu zhongshuai,gao Libo,Ren Wencai,Cheng Huiming Shenyang National Laboratory for Materials Science, Institute of Metal Research,Chinese Academy of Sciences, Shenyang 110016,China,

Graphene,as a one-atom-thick flat allotrope of carbon,has been attracting increasing interests because of its unique structure,excellent properties and a variety of promising ***, the properties of graphene are very s...

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Progress in Natural Science:Materials International 2018年第2期28卷 212-217页

作者： Zhigang Zhang Lianlian gao Yanfeng Dong Jinping Zhao zhongshuai Wu School of chemistry & chemical engineering Shandong University of Technology Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences

CoOis a promising high-performance anode for lithium ion batteries(LIBs), but suffers from unsatisfied cyclability originating duo to low electrical conductivity and large volume expansion during charge and discharge process. Herein, we successfully constructed the CoOnanoparticles embedded into graphene nanoscrolls(GNSs) as advanced anode for high-performance LIBs with large capacity and exceptional cyclability. The onedimensional(1 D) CoO/GNSs were synthesized via liquid nitrogen cold quenching of large-size graphene oxide nanosheets and sodium citrate(SC) modified CoOnanoparticles, followed by freeze drying and annealing at400 °C for 2 h in nitrogen atmosphere. Benefiting from the interconnected porous network constructed by 1 D CoO/GNSs for fast electron transfer and rapid ion diffusion, and wrinkled graphene shell for significantly alleviating the huge volume expansion of CoOduring lithiation and delithiation. The resultant CoO/GNSs exhibited ultrahigh reversible capacity of 1200 mAh gat 0.1 C, outperforming most reported ***, they showed high rate capability of 600 m Ah g-1 at 5 C, and outstanding cycling stability with a high capacity retention of 90% after 500 cycles. Therefore, this developed strategy could be extended as an universal and scalable approach for intergrating various metal oxide materials into GNSs for energy storage and conversion applications.

关键词： Graphene nanoscrolls Co3O4 Anode Lithium ion batteries Energy storage

Design and Fluid-Dynamic Analysis of a Flushing Nozzle for Drilling Applications

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Fluid Dynamics & Materials Processing 2023年第12期19卷 2953-2963页

作者： zhongshuai Chen Hongjian Ni Xueliang Pei Yu gao School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China Drilling Technology Research Institute of Shengli Petroleum Engineering Co. Ltd.SinopecDongying257000China Shenzhen South China Sea Oil Economic Development Company Shenzhen518000China

The actuator is a key component of the creaming tool in drilling *** jet performances determine the effective reaming *** this work,a new selective reaming tool is proposed and the RNG k-εturbulence model is used to calculate its internal and *** particular,special attention is paid to the design of theflushing *** results show that the jet originating from theflushing nozzle has a significant influence on rock cutting and blade cooling *** turn,the jet performances depend on geometric structure of the creaming *** this framework,a conical-cylindrical nozzle with a diameter of 7 mm is initially considered as a basis to implement a strategy to optimize the structural parameters of the reaming actuator,and improve the related side tracking reconstruction technology.

关键词： Reaming tool while drilling flowfluid characteristics flushing nozzle nozzle structure

Preparation and interface modification of Si3N4f/SiO2 composites

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Journal of Materials Science & Technology 2019年第12期35卷 2767-2771页

作者： Yubo Houa Xuejin Yang Bin Li Duan Li Shitao gao zhongshuai Wu Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense TechnologyChangsha410073China School of Materials Sun Yat-sen UniversityGuangzhou510275China

In order to modify the interface, Si ON coating was introduced on the surface of silicon nitride fiber by perhydropolysilazane conversion method. Si-3N4f/SiO2 and Si-3N4f/Si ONc/SiO2 composites were prepared by sol-gel method to explore the influence of Si ON coating on the mechanical properties of *** results show that with the protection of Si ON coating, Si-3N4fiber enjoys a strength increase of up to 24.1% and Si-3N4f/Si ONc/SiO2 composites have a tensile strength of 170.5 MPa and a modulus of26.9 GPa, respectively. After 1000℃ annealing in air for 1 h, Si-3N4f/Si ONc/SiO2 composites retain 65.0%of their original strength and show a better toughness than Si-3N4f/SiO2 composites. The improvement of mechanical properties is attributing to the healing effect of Si ON coating as well as its intermediate coefficient of thermal expansion between Si-3N4fiber and SiO2 matrix.

关键词： Si3N4 fiber Perhydropolysilazane SiON coating Interface Mechanical properties

有机-无机复合固化剂合成及重金属污染底泥固化研究

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环境工程 2024年第3期42卷 82-91页

作者：陈运涛肖瑶王健男高忠帅崔美黄仁亮中交天津港湾工程研究院有限公司天津300222 港口岩土工程技术交通运输行业重点实验室天津300222 天津市港口岩土工程技术重点实验室天津300222 中交第一航务工程局有限公司天津300222 天津大学海洋科学与技术学院天津300072

疏浚重金属污染底泥由于具有含水率高、强度低等特性,无法直接作为工程材料应用,并且会对环境造成污染。设计合成了一种丙烯酸-苯乙烯磺酸共聚物(AA-SSS),并与水泥和纳米水化硅酸钙(早强剂)混合,开发了一种有机-无机复合固化剂。探究了... 详细信息

疏浚重金属污染底泥由于具有含水率高、强度低等特性,无法直接作为工程材料应用,并且会对环境造成污染。设计合成了一种丙烯酸-苯乙烯磺酸共聚物(AA-SSS),并与水泥和纳米水化硅酸钙(早强剂)混合,开发了一种有机-无机复合固化剂。探究了有机-无机复合固化剂对底泥固化抗压强度和重金属离子稳定化的影响,并分析了其机理。结果表明:有机-无机复合固化剂对底泥固化强度增强效果显著,在10%水泥、1%AA-SSS、2%早强剂添加量下,底泥固化1 d的抗压强度为0.85 MPa,相比未加固化剂,提高了467%。在该条件下,底泥中的Pb^(2+)、Ni^(2+)、Cd^(2+)、Cr^(3+)的浸出浓度分别从7.05,8.32,4.40,7.12 mg/L降至2.68,2.61,0.68,2.05 mg/L,经固化稳定化后底泥酸浸出液中重金属浓度均低于危险废物鉴别标准值。水泥水化产物加强了淤泥颗粒之间的胶结,并包裹固定金属离子,同时AA-SSS和纳米水化硅酸钙可以分散和促进水泥水化,并通过静电作用和吸附作用固定金属离子。研究表明有机-无机复合固化剂在提高底泥抗压强度和重金属离子稳定化具有良好的应用前景。

关键词：重金属污染底泥固化剂无侧限抗压强度稳定化

Miro2 supplies a platform for Parkin translocation to damaged mitochondria

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Science Bulletin 2019年第11期64卷 730-747页

作者： Jiu-Qiang Wang Shu Zhu Yihan Wang Fengli Wang Chaoqiang An Dongfang Jiang Lijie gao Yingfeng Tu Xuefei Zhu Yun Wang Hongmei Liu Juanjuan Gong zhongshuai Sun Xi Wang Leimei Liu Keyan Yang Caixia Guo Tie-Shan Tang State Key Laboratory of Membrane Biology Institute of ZoologyUniversity of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100101China Key Laboratory of Genomics and Precision Medicine Beijing Institute of GenomicsUniversity of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100101China Department of Foresight and Evaluation Research Chinese Academy of Science and Technology for DevelopmentBeijing 100038China Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China

PINK1/Parkin-mediated mitophagy is an important process in selective removal of damaged mitochondria, in which translocation of Parkin to damaged mitochondria is recognized as an initiation step. At present, how the damaged mitochondria are selectively recognized and targeted by Parkin is not fully understood. Here we show that Miro2, an outer mitochondrial membrane protein, undergoes demultimerization from a tetramer to a monomer and alteration in mitochondrial localization upon CCCP treatment, suggesting a CCCP-induced realignment of Miro2. The realignment of Miro2 is tightly regulated by PINK1-mediated phosphorylation at Ser325/Ser430 and by Ca^2+binding to EF2 domain, which are both essential for the subsequent Parkin translocation. Interestingly, ablation of Miro2 in mouse causes delayed reticulocyte maturation, lactic acidosis and cardiac disorders. Furthermore, several Miro2 mutations found in the congenital lactic acidosis patients also disable its realignment and Parkin translocation. These findings reveal an important role of Miro2 to mediate Parkin translocation by sensing both depolarization and Ca^2+release from damaged mitochondria to ensure the accuracy of mitophagy.

关键词： Miro2 Parkin Mitochondria Ca^2+ Mitophagy PINK1

电化学阴极剥离制备少层石墨烯及其微型超级电容器

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化工学报 2020年第6期71卷 2724-2734,F0003页

作者：周锋田利军高磊吴忠帅中国科学院大连化学物理研究所辽宁大连116023 大同煤矿集团有限责任公司双创中心山西大同037003

以石墨为原料高效、绿色、低成本制备少层石墨烯,对石墨烯的规模化生产和应用具有非常重要的意义。电化学阴极剥离法是一种高效制备少层石墨烯的方法,但已有的报道均采用有机溶液体系,成本高且不够绿色环保。开发了一种绿色的水溶液电... 详细信息

以石墨为原料高效、绿色、低成本制备少层石墨烯,对石墨烯的规模化生产和应用具有非常重要的意义。电化学阴极剥离法是一种高效制备少层石墨烯的方法,但已有的报道均采用有机溶液体系,成本高且不够绿色环保。开发了一种绿色的水溶液电化学剥离方法,在6 mol·L^-1 KOH溶液中,将石墨作为阴极进行快速剥离制备出少层石墨烯。获得的少层石墨烯具有含氧量低[1.27%(质量)]、缺陷少(ID/IG<0.035)、片径尺寸为5~10μm、高电导率(大于200 S·cm^-1)以及良好溶液可加性等特点。基于此,采用叉指型掩模板辅助过滤的方法可以高效制备出图案化石墨烯基平面微电极,在硫酸-聚乙烯醇凝胶电解液中,构筑的准固态微型电容器在没有金属集流体存在的情况下,表现出高扫描速率,达到了100000 mV·s^-1,弛豫时间常数低至24 ms;以1-乙基-3甲基-咪唑双(三氟甲基磺酰基)亚胺和双(三氟甲基磺酰基)亚胺锂盐的混合液为电解液,所构建的微型超级电容器的工作电压达4.0 V,体积能量密度为113 mW·h·cm^-3,远高于目前报道的微型超级电容器的电化学性能(<50 mW·h·cm^-3)。

关键词：电化学阴极剥离石墨烯石墨微型超级电容器

基于土地利用与其功能动态耦合性的县域国土空间分类体系构建

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农业工程学报 2021年第24期37卷 284-296页

作者：欧定华张琪秦景龚上淇吴毅杰郑仲帅夏建国边金虎高雪松四川农业大学资源学院成都611130 自然资源部耕地资源调查监测与保护利用重点实验室成都611130 中国科学院、水利部成都山地灾害与环境研究所成都610041

国土空间分类是建立国土空间规划体系并监督实施的基础。该研究综合应用地理探测器q统计和地理时空分析法,基于土地利用及其功能的时空异质性和动态耦合性,建立了一种国土空间分类体系构建方法,并以四川省邛崃市为例,开展了县域国土空... 详细信息

国土空间分类是建立国土空间规划体系并监督实施的基础。该研究综合应用地理探测器q统计和地理时空分析法,基于土地利用及其功能的时空异质性和动态耦合性,建立了一种国土空间分类体系构建方法,并以四川省邛崃市为例,开展了县域国土空间分类体系构建及其与土地利用分类体系的衔接关系研究。结果表明:1)2010—2020年,邛崃市土地利用优势国土空间功能存在时空异质性,土地利用与其优势国土空间功能在空间分布上存在耦合性,二者耦合度以及与地类耦合的国土空间功能结构均存在时间异质性,这证实在国土空间分类体系构建中考虑土地利用及其功能的时空异质性和动态耦合性的必要性;2)邛崃市国土空间分类体系由3个一级空间类型、7个二级空间类型和14个三级空间类型组成,不同于国土空间分类理论框架体系,进一步证实土地利用及其功能的时空异质性和动态耦合性会影响国土空间分类结果,基于土地利用及其功能的时空异质性和动态耦合性构建的国土空间分类体系更符合实际,可以避免定性分析理论构建产生的偏差;3)建立了国土空间类型与土地利用类型的对应关系,实现"虚"的国土空间功能通过"实"的土地利用得以表达,为利用历史数据和成果资料提供了有效途径。研究结果可为当前国土空间规划与管理提供参考。

关键词：土地利用功能分类国土空间主导功能地理探测器时空动态耦合分析邛崃市

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融合位置估计的自适应尺度相关滤波跟踪

天津科技大学学报 2021年第1期36卷 62-67页

作者：王中帅周聪玲王永强高鹏天津科技大学机械工程学院天津300222

针对相关滤波跟踪算法中不能适应目标多尺度变化的问题,提出了一种融合位置估计和尺度估计的自适应尺度相关滤波器.通过提取当前图像中不同尺度大小的目标模板,作为先验信息加到滤波器中学习,训练滤波器.对多尺度模板训练赋予新的权重定... 详细信息

针对相关滤波跟踪算法中不能适应目标多尺度变化的问题,提出了一种融合位置估计和尺度估计的自适应尺度相关滤波器.通过提取当前图像中不同尺度大小的目标模板,作为先验信息加到滤波器中学习,训练滤波器.对多尺度模板训练赋予新的权重定义,重新定义了多尺度模板对应的标签.提高了滤波器对目标尺度变化的敏感度.通过在CVPR 2015数据集验证,该方法的精准率为0.803、成功率为0.705.特别是在多尺度环境影响下,该算法结果优于其他算法,达到了预期跟踪效果.

关键词：自适应相关滤波尺度变化目标跟踪